Análise dos parâmetros do modelo hidrossedimentológico SWAT na bacia hidrográfica do Córrego Samambaia, Goiânia- GO

• Autor(a) principal: Silva, Bruna Ferreira da
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000002f5v
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/5154
• topic: SWAT; Sedimento em suspensão; Vazão; Análise de sensibilidade; SWAT; Suspended sediment; Discharge; Sensitivity analysis; ENGENHARIA SANITARIA::SANEAMENTO AMBIENTAL; ENGENHARIA SANITARIA::RECURSOS HIDRICOS

Hydrological models have been a enough useful tool to management and decision-making support in river basin water resources planning since they are able to reproduce discharges and transport of sediments as well as to simulate different scenarios of land use and water quality. The main objective of this study is to perform the hydrossedimentological modeling of the Samambaia river basin Stream by applying the software SWAT. The study area is located in the north of the city of Goiânia and it has undergone an intense process of urbanization. Daily discharges and suspended sediment concentrations data were collected during 18 months in a specific section of the stream. The monitored data set has been used to analyze the influence of distinct parameters in the SWAT model adjustment. The results of the sensitivity analysis showed the parameters of soil evaporation compensation factor (Esco), threshold depth of water in the shallow aquifer required for return flow to occur (Gwqmn), available water capacity (Sol_Awc) and the depth of the soil layer (Sol_Z) as the most sensitive to simulations in terms of discharge, and the management practices and soil conservation parameter (Usle_P) to simulations in terms of suspended sediment concentrations. Best settings obtained for the precision statistics (Nash-Sutcliffe Coefficient - COE) were of 0.56 to 0.72 for calibration in terms of discharges and of 0.56 to 0.69 for calibration in terms of suspended sediment. The performance showed that the simulation with SWAT was adequate in relation to researches conducted in Brazil, whose values for model indicators are quite similar.